Title

Authors

Date of this Version

2004

Citation

HortScience, 39(6):1385-1386. 2004.

Comments

Copyright 2006 American Society for Horticultural Science. Used by permission.

Abstract

Studies were conducted to evaluate the effect of stratification and seed age on percent seedling emergence of Penstemon. Emergence differences occurred between the eight Penstemon selections, as well as between seed stratification treatments and seed age. Seed stratification significantly increased emergence. Emergence vaired from 0% with 1-year-old seed Penstemondigitalis with no stratification, to 72.8% emergence with 2-year-old seed of P. angustifolius with 10 weeks of stratification. Seedlings from 3- to 4- year-old seed generally emerged as well as or better than with 1- and 2-year-old seed. Percent emergence varied significantly with stratification, seed age, and species. Some emergence occurred with species from seed up to 10 years old.